<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
      
      <!-- 步骤条 -->
      <el-steps :space="200" :active="activeIndex - 0" finish-status="success"
                align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- tabs栏区域 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" 
                label-width="100px" label-position="top">
        <el-tabs v-model="activeIndex" :tab-position="'left'" 
                  :before-leave="beforeTabLeave" @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader v-model="addForm.goods_cat" :options="cateList" :props="cateProps"
                            @change="handleChange">
              </el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的item项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData"
                          :key="item.attr_id">
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals"
                              :key="i" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData"
                          :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action表示图片要上传到的后台api接口 -->
            <el-upload :action="uploadURL"
                        :on-preview="handlePreview" :on-remove="handleRemove"
                        list-type="picture" :headers="headerObj" :on-success="handleSuccess">
  <el-button size="small" type="primary">点击上传</el-button>
  <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
</el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce">
            </quill-editor>
            <el-button type="primary" id="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 图片预览 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" alt="" class="perviewImg">
    </el-dialog>

  </div>
</template>

<script>
  import _ from 'lodash'
  export default {
    name: "Add",
    data() {
      return {
        activeIndex: '0', //当前激活的步骤(默认为0)
        addForm: { //添加商品的表单数据对象
          goods_name: '',
          goods_price: 0,
          goods_weight: 0,
          goods_number: 0,
          goods_cat: [], //商品所属的分类数组
          pics: [], //图片的数组
          goods_introduce: '',//商品的详情描述
          attrs: [], //商品的参数数组，包含静态参数和动态参数
        },
        addFormRules: { //表单的数据规则
          goods_name: [{ required:true, message:'请输入商品名称', trigger:'blur' }],
          goods_price: [{ required:true, message:'请输入商品价格', trigger:'blur' }],
          goods_weight: [{ required:true, message:'请输入商品重量', trigger:'blur' }],
          goods_number: [{ required:true, message:'请输入商品数量', trigger:'blur' }],
          goods_cat: [{ required:true, message:'请选择商品分类', trigger:'blur' }],
        },
        cateList: [], //商品分类列表
        cateProps:{ //级联选择器的相关配置
          expandTrigger: 'hover',
          label: 'cat_name', //用户看懂的值
          value: 'cat_id', //实际选择的值
          children: 'children',
        },
        manyTableData: [], //动态参数列表数据
        onlyTableData: [], //静态参数列表数据
        uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
        headerObj: { //图片上传headers请求头对象
          Authorization: window.sessionStorage.getItem('token')
        },
        previewPath: '', //预览图片的url地址
        previewVisible: false, //默认隐藏图片预览对话框
      }
    },
    created() {
      this.getCateList()
    },
    methods: {
      //获取所有商品分类数据
      async getCateList() {
        const {data:res} = await this.$http.get('categories')
        if(res.meta.status != 200) {
          return this.$message.error('获取商品数据成功！')
        }
        this.cateList = res.data
        // console.log(this.cateList);
      },
      handleChange() { //级联选择器选中项发生变化时触发的函数
        // console.log(this.addForm.goods_cat); //goods_cat是个数组，里面有长度
        if(this.addForm.goods_cat.length != 3) {
          this.addForm.goods_cat = [] //如果选中的不是三级，则给该数据复制为空数组
        }
      },
      beforeTabLeave(activeName, oldActiveName) { //tabs左侧边栏发生切换时触发的函数
        //oldactiveName即将离开的标签页的名字
        //activeName即将进入的标签页的名字
        if(oldActiveName == '0' && this.addForm.goods_cat.length != 3) {
          this.$message.error('请先选择商品分类！')
          return false
        }
      },
      async tabClicked() {
        //证明访问的是动态参数面板
        if(this.activeIndex == '1') {
          // console.log('动态参数面板');
          const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
            params: {sel:'many'}
          })
          if(res.meta.status != 200) {
            return this.$message.error('获取动态参数列表失败！')
          }
          res.data.forEach(item => { //将data.attr_vals变成数组
            item.attr_vals = item.attr_vals.length==0 ? [] : item.attr_vals.split(' ')
          })
          this.manyTableData = res.data
        } 
        else if(this.activeIndex == '2') {
          const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
            params: {sel:'only'}
          })
          if(res.meta.status != 200) {
            return this.$message.error('获取静态属性列表失败！')
          }
          this.onlyTableData = res.data
        }
      },
      handlePreview(file) { //处理图片预览效果
        // console.log(file);
        this.previewPath = file.response.data.url
        this.previewVisible = true
      },
      handleRemove(file) { //处理移除图片的效果
        //file将要移除的图片的信息
        //1.获取将要删除的图片的零时路径
        const filePath = file.response.data.tmp_path
        //2.从pics数组中，找到这个图片的索引
        const i = this.addForm.pics.findIndex(x => { 
          return x.pic == filePath
        })
        //3.调用数组的splice方法，把图片信息对象，从pics数组中移除
        this.addForm.pics.splice(i, 1)
        console.log(this.addForm);
      },
      handleSuccess(response) { //监听图片上传成功的事件
        //response服务器返回的对象
        // console.log(response); //里面有图片的暂存地址等信息
        //1.拼接得到一个图片信息对象
        const picInfo = {pic: response.data.tmp_path}
        //2.将图片信息对象 push到pics数组中
        this.addForm.pics.push(picInfo)
        // console.log(this.addForm); //包含了商品的各项内容
      },
      //添加商品
      add() {
        // console.log(this.addForm);
        this.$refs.addFormRef.validate(async valid => {
          if(!valid) {
            return this.$message.error('请填写必要的表单项！')
            //基本信息里的？？？
          }
          //执行添加的业务逻辑
          //lodash cloneDeep(obj) 深拷贝对象的方法
          //_下划线就是表示lodash
          const form = _.cloneDeep(this.addForm)
          form.goods_cat = form.goods_cat.join(',')
          //处理动态参数
          this.manyTableData.forEach(item => {
            const newInfo = {
              attr_id: item.attr_id,
              attr_value: item.attr_vals.join(' ')
            }
            this.addForm.attrs.push(newInfo)
          })
          //处理静态属性
          this.onlyTableData.forEach(item => {
            const newInfo = { 
                attr_id: item.attr_id, 
                attr_value: item.attr_vals 
              }
            this.addForm.attrs.push(newInfo)
          })
          form.attrs = this.addForm.attrs
          console.log(form);

          //发起请求添加商品
          //商品名称必须是唯一的，否则会报错
          const { data: res } = await this.$http.post('goods', {params:this.addForm})

          if (res.meta.status !== 201) {
            console.log(res.meta.status);
            return this.$message.error('添加商品失败！')
          }
          this.$message.success('添加商品成功！')
          this.$router.push('/goods')
        })
      }
    },
    computed: {
      cateId() { //直接返回三级分类
        if(this.addForm.goods_cat.length == 3) {
          return this.addForm.goods_cat[2]
        }
        return null
      }
    }
  }
</script>

<style lang="less" scope>
  .el-checkbox {
    margin: 5px 0;
  }
  .perviewImg {
    width: 100%;
  }
  #btnAdd {
    margin-top: 15px;
  }
</style>